1998 年 53 巻 1 号 p. 47-52
Genetic differentiation among five populations of the Japanese freshwater crab Geothelphusa dehaani, each comprising one of three different body color types, dark brown (RE), dark purplish brown (DA), and grayish blue (BL), was examined by means of electrophoretic analysis of 16 enzyme loci. Allelic replacement was observed between the BL-type population and populations of the other two types (RE and DA) at three loci (α Gpd, Gpi, and Sod-1), but not between the RE-and DA-type populations. The average of Nei's genetic distance (D) was 0.035 between the RE and DA populations (range of 0.013-0.061), 0.251 between the RE and BL populations (0.244-0.260), and 0.296 between the DA and BL populations. These results suggest that the BL type is only distantly related to the other two color types (RE and DA).
